US9357791B2 - Coffee products and related processes - Google Patents

Coffee products and related processes Download PDF

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Publication number
US9357791B2
US9357791B2 US13/810,612 US201113810612A US9357791B2 US 9357791 B2 US9357791 B2 US 9357791B2 US 201113810612 A US201113810612 A US 201113810612A US 9357791 B2 US9357791 B2 US 9357791B2
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Prior art keywords
coffee
particles
roasted
soluble
product
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US20130202748A1 (en
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Gerald Olean Fountain
Alan Gundle
Won Cheal Kang
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Mondelez UK R&D Ltd
Intercontinental Great Brands LLC
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Kraft Foods R&D Inc USA
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    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23F—COFFEE; TEA; THEIR SUBSTITUTES; MANUFACTURE, PREPARATION, OR INFUSION THEREOF
    • A23F5/00—Coffee; Coffee substitutes; Preparations thereof
    • A23F5/24—Extraction of coffee; Coffee extracts; Making instant coffee
    • A23F5/28—Drying or concentrating coffee extract
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23F—COFFEE; TEA; THEIR SUBSTITUTES; MANUFACTURE, PREPARATION, OR INFUSION THEREOF
    • A23F5/00—Coffee; Coffee substitutes; Preparations thereof
    • A23F5/08—Methods of grinding coffee
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23F—COFFEE; TEA; THEIR SUBSTITUTES; MANUFACTURE, PREPARATION, OR INFUSION THEREOF
    • A23F5/00—Coffee; Coffee substitutes; Preparations thereof
    • A23F5/10—Treating roasted coffee; Preparations produced thereby
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23F—COFFEE; TEA; THEIR SUBSTITUTES; MANUFACTURE, PREPARATION, OR INFUSION THEREOF
    • A23F5/00—Coffee; Coffee substitutes; Preparations thereof
    • A23F5/24—Extraction of coffee; Coffee extracts; Making instant coffee
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23F—COFFEE; TEA; THEIR SUBSTITUTES; MANUFACTURE, PREPARATION, OR INFUSION THEREOF
    • A23F5/00—Coffee; Coffee substitutes; Preparations thereof
    • A23F5/24—Extraction of coffee; Coffee extracts; Making instant coffee
    • A23F5/28—Drying or concentrating coffee extract
    • A23F5/30—Drying or concentrating coffee extract by freezing out the water
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23F—COFFEE; TEA; THEIR SUBSTITUTES; MANUFACTURE, PREPARATION, OR INFUSION THEREOF
    • A23F5/00—Coffee; Coffee substitutes; Preparations thereof
    • A23F5/24—Extraction of coffee; Coffee extracts; Making instant coffee
    • A23F5/28—Drying or concentrating coffee extract
    • A23F5/32—Drying or concentrating coffee extract by lyophilisation
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23F—COFFEE; TEA; THEIR SUBSTITUTES; MANUFACTURE, PREPARATION, OR INFUSION THEREOF
    • A23F5/00—Coffee; Coffee substitutes; Preparations thereof
    • A23F5/24—Extraction of coffee; Coffee extracts; Making instant coffee
    • A23F5/28—Drying or concentrating coffee extract
    • A23F5/34—Drying or concentrating coffee extract by spraying into a gas stream
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23F—COFFEE; TEA; THEIR SUBSTITUTES; MANUFACTURE, PREPARATION, OR INFUSION THEREOF
    • A23F5/00—Coffee; Coffee substitutes; Preparations thereof
    • A23F5/24—Extraction of coffee; Coffee extracts; Making instant coffee
    • A23F5/36—Further treatment of dried coffee extract; Preparations produced thereby, e.g. instant coffee
    • A23F5/40—Further treatment of dried coffee extract; Preparations produced thereby, e.g. instant coffee using organic additives, e.g. milk, sugar
    • A23F5/405—Further treatment of dried coffee extract; Preparations produced thereby, e.g. instant coffee using organic additives, e.g. milk, sugar comprising ground coffee or ground coffee substitute particles
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J31/00—Apparatus for making beverages
    • A47J31/06—Filters or strainers for coffee or tea makers ; Holders therefor
    • A47J31/0657—Filters or strainers for coffee or tea makers ; Holders therefor for brewing coffee under pressure, e.g. for espresso machines
    • A47J31/0668—Filters or strainers for coffee or tea makers ; Holders therefor for brewing coffee under pressure, e.g. for espresso machines specially adapted for cartridges
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J31/00—Apparatus for making beverages
    • A47J31/44—Parts or details or accessories of beverage-making apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D85/00—Containers, packaging elements or packages, specially adapted for particular articles or materials
    • B65D85/70—Containers, packaging elements or packages, specially adapted for particular articles or materials for materials not otherwise provided for
    • B65D85/804—Disposable containers or packages with contents which are mixed, infused or dissolved in situ, i.e. without having been previously removed from the package
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D85/00—Containers, packaging elements or packages, specially adapted for particular articles or materials
    • B65D85/70—Containers, packaging elements or packages, specially adapted for particular articles or materials for materials not otherwise provided for
    • B65D85/804—Disposable containers or packages with contents which are mixed, infused or dissolved in situ, i.e. without having been previously removed from the package
    • B65D85/8043—Packages adapted to allow liquid to pass through the contents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D85/00—Containers, packaging elements or packages, specially adapted for particular articles or materials
    • B65D85/70—Containers, packaging elements or packages, specially adapted for particular articles or materials for materials not otherwise provided for
    • B65D85/804—Disposable containers or packages with contents which are mixed, infused or dissolved in situ, i.e. without having been previously removed from the package
    • B65D85/8043—Packages adapted to allow liquid to pass through the contents
    • B65D85/8046—Pods, i.e. closed containers made only of filter paper or similar material

Definitions

  • the present application relates to coffee products and processes for forming coffee products.
  • it relates to soluble coffee products incorporating a percentage of roasted ground coffee and processes for forming such products.
  • Instant soluble coffee products such as freeze-dried and spray-dried instant coffee
  • An example of a freeze-dried instant coffee is Kenco® Smooth freeze dried coffee.
  • Such instant soluble coffee products are formed by deriving a liquid coffee concentrate intermediate (commonly known as coffee liquor) from coffee beans by the well known processes of roasting and extraction.
  • the coffee concentrate may be aromatized by the addition of coffee aromas stripped from an extracted coffee intermediate, again as well known in the art.
  • the coffee concentrate is then subjected to various foaming and drying steps to produce a dry granular end product that can be reconstituted into a coffee beverage by the addition of hot water.
  • Instant soluble coffee products are popular with consumers as they provide an economical, fast and simple way of preparing a coffee beverage.
  • there has been a desire to produce instant soluble coffee products which are more pronounced of roasted ground coffee products both in the appearance of the product prior to reconstitution and when consumed.
  • WO2010/005604 describes various soluble coffee products blended from soluble and ground coffee components.
  • a problem that the present applicant has found with soluble coffee products incorporating a roasted ground coffee component is that it is difficult to adequately disperse the roasted ground coffee particles within the liquid coffee concentrate intermediate. Poor dispersion can lead to clumping of the roasted ground coffee particles on addition to the liquid coffee intermediate leading to non-hydrated regions of roasted ground coffee which never fully ‘wet’.
  • U.S. Pat. No. 4,594,257 describes an agglomerated instant coffee product comprising spray-dried instant coffee and roasted coffee colloidal particles having a particle size of 5 to 25 microns.
  • GB2022394 describes a process of quenching roasted coffee beans in liquid nitrogen before being ground to a particle size of less than 45 microns.
  • Another suggested solution to permit colloidal grinding of roasted coffee beans is to add additional oil to the grinding mixture to provide additional lubrication. Whilst this can in some situations overcome the problem of fouling of the grinding machine surfaces it results in a ground coffee product with a high oil content that is not ideal for use as a coffee intermediate for further processing into an instant soluble coffee beverage since only a relatively small amount can be added to products without a detrimental affect on the product composition.
  • EP1631151 Another suggested solution in EP1631151 is to add an additional component such as cocoa mass or sugar to absorb any coffee oil released by the roasted and ground coffee.
  • an additional component such as cocoa mass or sugar to absorb any coffee oil released by the roasted and ground coffee.
  • this process is unsuitable where the desire is to use the colloidal roasted ground coffee in a pure soluble coffee beverage.
  • roasted coffee means a coffee substance that has been produced by the roasting of green coffee beans.
  • the substance may be in the form of a roasted coffee bean or in some other form produced by onward processing steps such as grinding, decaffeination, pressing, etc.
  • roasted coffee include roasted coffee beans, roasted expeller cake, roasted and flaked coffee.
  • roasted ground coffee means a roasted coffee substance that has been subject to a comminution process in order to reduce the particle size of the original roasted coffee substance.
  • the comminution process may include one or more of grinding, chopping, pounding and crushing.
  • Helos particle size distribution D90 means the 90th percentile figure by volume of the particle size distribution, as obtained from a HelosTM laser light diffraction particle size analyzer available from Sympatec, Clausthal-Zellerfeld, Germany. That is, the D90 is a value on the distribution such that 90% by volume of the particles have a characteristic size of this value or less.
  • the figure may be obtained for a dry sample (referred to as “dry Helos”) or for a wet sample (referred to as “wet Helos”), e.g. after mixing of the particles with water.
  • dry Helos dry sample
  • wet Helos wet sample
  • D50 where the value represents the 50th percentile figure of the particle size distribution.
  • Helos is a laser diffraction sensor system for which one evaluation method is applied over the whole measuring range from 0.1 ⁇ m to 8750 ⁇ m.
  • This instrument is designed for particle size analysis of dry and wet samples, i.e. of powders, suspensions, emulsions or sprays.
  • the beverage is made up to 1.5% concentration (3 g solids in 200 ml water) using 100° C. water and dripped into cuvette (with magnetic stirrer coated with PTFE running at 1000 RPM) to aim for an optical concentration between 20 and 25%.
  • cuvette with magnetic stirrer coated with PTFE running at 1000 RPM
  • an integrated sonication finger made from Titanium can be lowered manually into the cuvette.
  • Dry Particle Size Distribution is measured using HELOS/KF, R4 Lens, RODOS/M Dispersing System and VIBRI Feeder manufactured by Sympatec GmbH.
  • the reference to colour in “La units” means the unit reading measured using visible light reflectance of a sample of the roasted ground or soluble coffee using a Dr. Lange® Colour Reflectance Meter Model LK-100 with an internal 640 nm filter, available from Dr. Lange GmbH, Dusseldorf, Germany.
  • the present disclosure describes a freeze-dried soluble coffee product comprising 5 to 30% by dry weight roasted ground coffee and 70 to 95% by dry weight equivalent soluble coffee, wherein the roasted ground coffee has a dry Helos particle size distribution D90 of less than or equal to 100 microns; the freeze-dried soluble coffee product having a colour of 13 to 30 La units on the Lange scale.
  • the freeze-dried soluble coffee product comprises 10 to 20% by dry weight roasted ground coffee and 80 to 90% by dry weight equivalent soluble coffee.
  • the freeze-dried soluble coffee product comprises 15% by dry weight roasted ground coffee and 85% by dry weight equivalent soluble coffee.
  • freeze-dried soluble coffee product has been described as comprising both roasted ground coffee and soluble coffee this does not preclude the possibility of the product also comprising additional components.
  • prior art freeze-dried soluble coffee products typically have a colour of greater than 25 La units Even use of the prior art process of gasification was unable to produce an end product with a colour of less than 21 La units.
  • prior art roasted ground coffee typically has a colour of 6 to 13 La units.
  • the roasted ground coffee has a dry Helos particle size distribution D90 of less than or equal to 50 microns, more preferably less than or equal to 30 microns.
  • the freeze-dried soluble coffee product has a colour of 16 to 25 La units on the Lange scale. More preferably the freeze-dried soluble coffee product has a colour of 17 to 20 La units on the Lange scale.
  • the freeze-dried soluble coffee product has a density of 185 to 265 g/liter. More preferably the freeze-dried soluble coffee product has a density of 205 to 235 g/liter. In one example the freeze-dried soluble coffee product has a density of 225 g/liter.
  • the darkening of the end product by addition of roasted ground coffee particles allows an end product to be produced that achieves consumer-expected density and solubility levels.
  • the freeze-dried soluble coffee product has a particle size range of 0.3 to 3.5 mm. More preferably the freeze-dried soluble coffee product has a particle size range of 0.3 to 2.5 mm. In one example the freeze-dried soluble coffee product has a particle size range of 0.3 to 1.5 mm.
  • the freeze-dried product is enabled to be ground and sieved to a particle size that is reminiscent of a roasted ground coffee product.
  • the roasted ground coffee may be obtained by known processes such as cryogenic milling of roasted coffee beans as well known in the art and described, by way of example, in GB2022394 noted above. However, preferably the roasted ground coffee is obtained by the novel comminution process of a fourth aspect of the present disclosure as will be described further below.
  • the freeze-dried soluble coffee product is produced by the novel process of a second aspect of the present disclosure which will be described further below.
  • the present disclosure describes a process of forming a freeze-dried soluble coffee product, comprising the steps of:
  • step ii) and/or step iii) a milled and blended coffee intermediate is incorporated;
  • milled and blended coffee intermediate comprises 10 to 80% by dry weight roasted ground coffee and 20 to 90% by dry weight soluble coffee.
  • the present disclosure describes a process of forming a spray-dried soluble coffee product, comprising the steps of:
  • step ii) and/or step iv) a milled and blended coffee intermediate is incorporated;
  • milled and blended coffee intermediate comprises 10 to 80% by dry weight roasted ground coffee and 20 to 90% by dry weight soluble coffee.
  • the milled and blended coffee intermediate of the second or third aspects comprises 10 to 70% by dry weight roasted ground coffee and 30 to 90% by dry weight soluble coffee. More preferably, the milled and blended coffee intermediate of the second or third aspects comprises 15 to 50% by dry weight roasted ground coffee and 50 to 85% by dry weight soluble coffee. In one example the milled and blended coffee intermediate of the second or third aspects comprises 50% by dry weight roasted ground coffee and 50% by dry weight soluble coffee.
  • the milled and blended coffee intermediate of the second or third aspects has a dry Helos particle size distribution D90 of less than or equal to 40 microns. More preferably the milled and blended coffee intermediate of the second or third aspects has a dry Helos particle size distribution D90 of less than or equal to 30 microns.
  • the freeze-dried or spray-dried coffee product comprises 5 to 30% by dry weight roasted ground coffee and 70 to 95% by dry weight equivalent soluble coffee. More preferably the freeze-dried or spray-dried coffee product comprises 10 to 20% by dry weight roasted ground coffee and 80 to 90% by dry weight equivalent soluble coffee. In one example the freeze-dried or spray-dried coffee product comprises 15% by dry weight roasted ground coffee and 85% by dry weight equivalent soluble coffee.
  • freeze-dried or spray-dried coffee product has been described as comprising both roasted ground coffee and soluble coffee this does not preclude the possibility of the product also comprising additional components.
  • the soluble coffee of the milled and blended coffee intermediate may comprise spray-dried instant coffee, freeze-dried instant coffee, or a mixture thereof.
  • the ground coffee intermediate of the process of forming a freeze-dried soluble coffee product described above prior to drying may have a total coffee solids concentration of greater than or equal to 52% and less than or equal to 63%.
  • the coffee intermediate of the process of forming a spray-dried soluble coffee product described above prior to drying may have a total coffee solids concentration of greater than or equal to 52% and less than or equal to 63%.
  • the total coffee solids concentration may preferably be 56% to 60%.
  • the second and third aspects of the present disclosure extend to a soluble coffee product produced by the above described processes.
  • the second and third aspects of the present disclosure extend to a coffee beverage formed using the soluble coffee product described above.
  • the present disclosure describes a coffee milling process comprising the steps of:
  • comminuting the roasted coffee precursor in this manner has been found to provide an excellent means for reducing the particle size of the roasted coffee without the deleterious effects previously encountered by release of coffee oil from the roasted coffee precursor.
  • the incorporation of the particles of soluble coffee into the milling chamber results in the soluble coffee absorbing some, and preferably most or all of the coffee oil released during comminution.
  • the particles of soluble coffee are actively used as a comminuting agent within the milling chamber by impacting the particles of the roasted coffee precursor with the particles of soluble coffee.
  • the particles of soluble coffee precursor impacting other particles of roasted coffee precursor.
  • the additional comminution caused by impacting the roasted coffee precursor with particles of soluble coffee produces an enhanced milling action. This is particularly surprising considering that the particles of soluble coffee are not particularly hard.
  • the mobilised roasted coffee particles can be directed to impact additional surfaces, such as impact plates, of the milling chamber to provide additional comminution effects.
  • additional surfaces such as impact plates
  • the use of such impacts is not essential to the process.
  • the particles of the roasted coffee precursor and the soluble coffee may be mixed together before introduction into the milling chamber.
  • the ingredients may be batch mixed in the dry form and introduced into the milling chamber via a common hopper feed.
  • the particles of the roasted coffee precursor and the soluble coffee may be introduced separately into the milling chamber.
  • separate hoppers for the roasted coffee precursor and the soluble coffee precursor may be provided.
  • Another possibility is the use of a single feed line which may be used to jet one precursor into the milling chamber which acts to entrain the other precursor into the flow.
  • the particles of the roasted coffee precursor in step a) are at a temperature of between 5 and 30 degrees Celsius.
  • the milling chamber is not subject to cryogenic cooling during steps b), c) and d).
  • a particular advantage of the aspects of the present disclosure is that cryogenic cooling of the roasted coffee precursor to prevent coffee oil release is not required, even where the milling is down to colloidal particle sizes.
  • the coffee precursor may optionally be subject to some pre-chilling before milling, for example by being refrigerated to a temperature as low as 5 degrees Celsius. However, the roasted coffee precursor may also be used at ambient temperature (typically 20 to 25 degrees Celsius).
  • the physical components of the milling apparatus are cooled.
  • the chilled gas will result in some cooling of the milling apparatus. However, this is significantly less than typically results during cryogenic cooling.
  • the gas may be at a temperature between ⁇ 20 degrees Celsius and ambient temperature. In one example gas at a temperature of ⁇ 16 degrees Celsius was used.
  • the milled and blended coffee product produced in step d) comprises 10 to 80% by dry weight roasted ground coffee and 20 to 90% by dry weight soluble coffee. More preferably the milled and blended coffee product produced in step d) comprises 10 to 70% by dry weight roasted ground coffee and 30 to 90% by dry weight soluble coffee. Even more preferably the milled and blended coffee product produced in step d) comprises 15 to 50% by dry weight roasted ground coffee and 50 to 85% by dry weight soluble coffee. In one example the milled and blended coffee product produced in step d) comprises 50% by dry weight roasted ground coffee and 50% by dry weight soluble coffee.
  • Milling to produce a product containing above 70% by dry weight roasted ground coffee may be made possible where the feed gas is chilled down to a temperature of around ⁇ 20 degrees Celsius as discussed above. Otherwise limiting the percentage of roasted ground coffee in the product to a maximum of 70% is preferred.
  • step d) the comminution results in the milled and blended coffee product having a dry Helos particle size distribution D90 of less than or equal to 40 microns. More preferably in step d) the comminution results in the milled and blended coffee product having a dry Helos particle size distribution D90 of less than or equal to 30 microns.
  • the particles of roasted coffee precursor may be whole roasted coffee beans or coarsely-ground roasted coffee beans.
  • the process finds application with whole roasted coffee beans which provides a simplified process route. However, if desired, an initial coarse grind of the roasted coffee beans can be carried out before the roasted coffee is inserted into the milling chamber.
  • the particles of soluble coffee may be particles of spray-dried instant coffee, particles of freeze-dried instant coffee, or a mixture thereof.
  • soluble coffee type that matches the type of end product that the milled and blended coffee product is to be utilised in.
  • the soluble coffee product used as a comminuting agent in the milling chamber may be chosen also to be freeze-dried soluble coffee.
  • the types of soluble coffee used in the process may be mixed and altered as desired.
  • the gas jetted into the milling chamber in step b) is nitrogen, air, or a mixture thereof.
  • the milling chamber may form part of a jet mill.
  • mills include fluid bed opposed jet mills, Jet-O-MizerTM mills, vortex mill, spiral mills, etc.
  • the fourth aspect of the present disclosure extends to a milled and blended coffee product produced by the process described above.
  • the milled and blended coffee product may be used as a milled and blended coffee intermediate in the processes of the second and third aspects of the present disclosure described above.
  • the milled and blended coffee product may be used in the onward production of other coffee-based products.
  • the milled and blended coffee product may be packaged and sold as an end product in its own right.
  • the present disclosure extends to a container containing the milled and blended coffee product described above or the soluble coffee product described above or the freeze-dried soluble coffee product described above.
  • the container may be a bottle, a jar, a tin, a refill pack, a sachet, a stick pack, a filter bag or a container suitable for use in a beverage preparation machine such as a flexible pad formed at least partly from filtering material, or a rigid, semi-rigid or flexible cartridge formed from substantially air- and water-impermeable materials.
  • the container may further contain one or more additional beverage components such as natural or artificial sweeteners, dairy or non-dairy based creamers, lactose, vegetable fat, whey proteins, emulsifiers, stabilisers, modified starches, carriers, fillers, flavours, colours, nutrients, preservatives, flow agents or foaming agents.
  • additional beverage components such as natural or artificial sweeteners, dairy or non-dairy based creamers, lactose, vegetable fat, whey proteins, emulsifiers, stabilisers, modified starches, carriers, fillers, flavours, colours, nutrients, preservatives, flow agents or foaming agents.
  • the present disclosure extends to a beverage preparation machine in combination with at least one container suitable for use in said beverage preparation machine such as a flexible pad formed at least partly from filtering material, or a rigid, semi-rigid or flexible cartridge formed from substantially air- and water-impermeable materials, said at least one container containing the milled and blended coffee product described above or the soluble coffee product described above or the freeze-dried soluble coffee product described above.
  • at least one container suitable for use in said beverage preparation machine such as a flexible pad formed at least partly from filtering material, or a rigid, semi-rigid or flexible cartridge formed from substantially air- and water-impermeable materials
  • the present disclosure extends to method of making a beverage comprising the step of mixing the milled and blended coffee product described above or the soluble coffee product described above or the freeze-dried soluble coffee product described above with an aqueous liquid, preferably hot water.
  • the mixing may be performed by a beverage preparation machine. Alternatively, the mixing may be by hand in a receptacle.
  • FIG. 1 is a schematic illustration of the workings of a jet mill
  • FIG. 2 is a graph of particle size in microns against Helos particle size distribution D90;
  • FIG. 3 is a flow diagram illustrating prior art processes for forming freeze-dried and spray-dried soluble coffee
  • FIG. 4 a is a flow diagram illustrating a process for forming a freeze-dried soluble coffee product according to the present disclosure
  • FIG. 4 b is a flow diagram illustrating a modification of the process of FIG. 4 a;
  • FIG. 5 a is a flow diagram illustrating another process for forming a freeze-dried soluble coffee product according to the present disclosure
  • FIG. 5 b is a flow diagram illustrating a modification of the process of FIG. 5 a;
  • FIG. 6 is a flow diagram illustrating a process for forming a spray-dried soluble coffee product according to the present disclosure
  • FIG. 7 is a flow diagram illustrating another process for forming a spray-dried soluble coffee product according to the present disclosure
  • FIG. 8 is a graph of colour reduction in La units for various freeze-dried soluble coffee products
  • FIG. 9 shows a first example of container
  • FIG. 10 shows a second example of container
  • FIG. 11 shows an example of a beverage preparation machine
  • FIGS. 12 to 15 show scanning electron microscope photographs of various sample products.
  • a milled and blended coffee product may be produced by comminuting a roasted coffee precursor in a milling apparatus such as a jet mill.
  • a suitable jet mill is the Jet-O-MizerTM mill available from Fluid Energy Processing and Equipment Company, Telford, Pa., USA.
  • Another suitable mill is the Hosokawa Alpine Fluid Bed Opposed Jet Mill—AFG, available from Hosakawa Micron Ltd, Runcorn, Cheshire, United Kingdom.
  • Other suitable milling apparatus include mills referred to as spiral mills and vortex mills.
  • FIG. 1 A schematic illustration of the working principles of a jet mill is shown in FIG. 1 .
  • the mill 1 comprises a milling chamber 2 having a feed inlet 3 , a series of gas inlets 4 , a size classification wheel 8 and a product outlet 5 .
  • the milling chamber 2 of FIG. 1 takes the form of a generally cylindrical body having the gas inlets 4 at a lower end and spaced around the periphery and the product outlet 5 located near an upper end.
  • the feed inlet 3 communicates with the milling chamber 2 to allow ingredient precursor(s), in the form of whole or coarsely-ground roasted coffee beans and soluble coffee particles, to be fed into the milling chamber 2 tangentially at a location at or near the chamber periphery.
  • the size classification wheel 8 is located near the upper end of the milling chamber 2 and is adapted to received comminuted particles from the chamber 2 and pass those under a desired particle size to the product outlet 5 .
  • the roasted coffee precursor and the soluble coffee precursor are dry batch mixed at the required ratio and then deposited in a hopper which communicates with the feed inlet 3 as shown schematically in FIG. 1 by arrow A.
  • a feed gas supply may be provided to entrain the precursors from the hopper and convey them to the chamber 2 .
  • Compressed gas is supplied in use to the plurality of gas inlets 4 .
  • the gas inlets 4 are orientated at an angle to the radial direction of the chamber 2 —preferably tangentially to the chamber 2 —such that flow of gas through the gas inlets 4 sets up a swirling, spiralling gas flow within the chamber 2 .
  • the precursors are fed into the chamber 2 and mobilised in the chamber 2 by the high speed flow of gas entering the chamber 2 through the gas inlets 4 (and also the feed gas (where used) entering with the precursors through the feed inlet 3 ).
  • Comminution occurs due to the high velocity collisions between the particles of roasted coffee precursor and the soluble coffee resulting in pulverisation of the roasted coffee precursor.
  • the size classification wheel 8 acts to classify the particles it receives and pass onward to the product outlet 5 those particles less than a desired particle size.
  • the particles exit the mill as shown schematically in FIG. 1 by arrow B.
  • the larger particles are retained in the chamber and are subject to further comminution.
  • the jet mill also helps to classify the particle size output through the product outlet 5 .
  • the orientation and configuration of the milling chamber 2 , gas inlets 4 , and product outlet 5 can be altered.
  • the gas supplied to the gas inlets 4 and the feed gas for conveying the roasted coffee precursor into the chamber 2 may be air, but is preferably an inert gas, such as nitrogen.
  • the feed gas may be dehumidified and/or chilled in order to help remove moisture from the chamber 2 generated during milling. Dehumidification may be, for example, by use of a desiccant- or compressor-based dehumidifier.
  • the gas supplied to the gas inlets 4 may be chilled.
  • the roasted coffee precursor may be whole roasted coffee beans or alternatively may be coffee beans that have been coarsely ground using a conventional milling process to have a particle size of greater than 100 microns.
  • the soluble coffee may be a spray-dried or freeze-dried instant coffee product.
  • the particle size of the soluble coffee product before jet milling is typically between 100 and 350 microns for spray-dried soluble coffee and 0.1 to 3.5 mm for freeze-dried soluble coffee.
  • the mill 1 is not necessary for the mill 1 to be subjected to cryogenic cooling prior or during the milling process. Rather, the mill 1 is preferably operated at substantially the ambient temperatures existing at the location where the mill 1 is situated.
  • the feed gas and/or gas supplied to the gas inlets may optionally be chilled which may result in a modicum of cooling of the apparatus components.
  • the throughput of the jet mill may be beneficially increased by using cool gas supplied to the gas inlets 4 , for example to a temperature of ⁇ 16 degrees Celsius, in particular where the ratio of dry weight of roasted ground coffee to dry weight soluble coffee in the milled and blended coffee product is greater than 50%. In particular this may allow the percentage by dry weight of the roasted ground coffee in the mix to be up to 80%.
  • the following results were achieved using a Roto-Jet 15 mill available from Fluid Energy Processing and Equipment Company, Telford, Pa., USA. The mill was fed with 100% Arabica beans roasted to 8 La.
  • the pressure to the gas inlets 4 was 7 bar and the supplied gas was desiccated air which was cooled to +5 degrees Celsius for the first sample and ⁇ 16 degrees Celsius for the second sample.
  • the classifier of the jet mill was controlled to produce a particle size distribution D90 of 30 microns.
  • the roasted coffee precursor is not subjected to cryogenic cooling or any cryogenic pre-treatment prior to milling.
  • the temperature of the roasted coffee precursor when filled into the hopper 6 will be in the range 5 to 30° C.
  • the roasted coffee precursor may be at the ambient room temperature of the milling apparatus.
  • the milled and blended coffee product obtained from product outlet 5 comprises 20 to 90% by dry weight soluble coffee and 10 to 80% by dry weight roasted ground coffee.
  • the milled and blended coffee product obtained from product outlet 5 comprises 30 to 90% by dry weight soluble coffee and 10 to 70% by dry weight roasted ground coffee.
  • the milled and blended coffee product comprises 50 to 85% by dry weight soluble coffee and 15 to 50% by dry weight roasted ground coffee.
  • the milled and blended coffee product comprises 50% by dry weight soluble coffee and 50% by dry weight roasted ground coffee.
  • the milled and blended coffee product After milling, the milled and blended coffee product has a particle size distribution with a dry Helos particle size distribution D90 of less than or equal to 40 microns, more preferably less than or equal to 30 microns.
  • FIG. 2 shows results for the dry Helos particle size distribution D90 (and in addition wet Helos figures) for milled and blended coffee products produced according to the present disclosure as a function of the dry weight percentage of roasted ground coffee present.
  • the dry Helos particle size distribution D90 is less than or equal to 40 microns.
  • the dry Helos particle size distribution D90 increases deleteriously. (As noted above, this may be ameliorated by chilling the feed gas to the jet mill).
  • a dry Helos particle size distribution D90 of 30 microns or less is achievable.
  • a blend of Brazilian and Columbian Arabica beans was roasted to a colour of 11.5 La and pre-ground to a D50 of 500 microns.
  • the resulting roasted coffee precursor was dry batch mixed with Arabica spray-dried coffee at a ratio of 50% roasted coffee precursor to 50% spray-dried coffee precursor.
  • the resultant blend was then milled in a Hosokawa Alpine Fluid Bed Opposed Jet Mill—AFG at a variety of feed rates and classifiers speeds. The following results were obtained:
  • Another aspect of the present disclosure relates to processes for producing novel soluble instant coffee products incorporating a milled and blended coffee product containing a percentage of roasted ground coffee.
  • FIG. 3 illustrates the stages involved. Green coffee beans are roasted and then ground before being added to water to extract the coffee bean constituents.
  • coffee aroma may be stripped at this point to produce a liquid aroma product.
  • the extraction liquid is then concentrated, for example in percolation columns to produce a concentrated extract, commonly known as coffee liquor.
  • the previously produced aroma product may be incorporated to produce an aromatised coffee concentrate intermediate.
  • Such processes are well known.
  • the remainder of the procedure depends on whether the soluble product is to be spray-dried or freeze-dried.
  • the remaining process steps include foaming, filtering and homogenising and spray drying to produce the spray-dried product.
  • the remaining process steps include foaming and pre-freezing, freezing, grinding & sieving and vacuum drying.
  • the milled and blended coffee intermediate itself may contain 10 to 80% by dry weight roasted ground coffee and 20 to 90% by dry weight soluble coffee.
  • the milled and blended coffee intermediate contains 10 to 70% by dry weight roasted ground coffee and 30 to 90% by dry weight soluble coffee.
  • the milled and blended coffee intermediate contains 15 to 50% by dry weight roasted ground coffee and 50 to 85% by dry weight soluble coffee.
  • the milled and blended coffee intermediate comprises 50% by dry weight soluble coffee and 50% by dry weight roasted ground coffee.
  • the soluble coffee component of the milled and blended coffee intermediate in any of the processes below may be derived from spray-dried instant coffee, freeze-dried instant coffee, or a mixture thereof.
  • the milled and blended coffee intermediate preferably has a dry Helos particle size distribution D90 of less than or equal to 40 microns, more preferably less than or equal to 30 microns.
  • the end coffee product may comprise 5 to 30% by dry weight roasted ground coffee and 70 to 95% by dry weight equivalent of soluble coffee.
  • a soluble coffee end product containing 15% by dry weight roasted ground coffee and 85% by dry weight equivalent soluble coffee can be obtained by mixing the liquid coffee concentrate with a dry milled and blended coffee intermediate having 50% by dry weight roasted ground coffee and 50% by dry weight soluble coffee in a ratio of 70:30 coffee concentrate intermediate to milled and blended coffee intermediate.
  • the milled and blended coffee intermediate is produced using the novel process of the present disclosure described above with reference to FIG. 1 .
  • milled and blended coffee intermediates having the requisite percentages of roasted ground coffee and soluble coffee may be used, even where produced by alternative means.
  • FIG. 4 a shows a first freeze-dried process for forming a freeze-dried soluble coffee product 25 .
  • a coffee concentrate intermediate 20 (aromatised or non-aromatised) is mixed with a milled and blended coffee intermediate 30 using a high shear mixer 50 prior to the foaming and pre-freezing step 21 .
  • Suitable mixers include high shear batch mixers and high shear in-line mixers available from Silverson Machines Ltd, Chesham, United Kingdom.
  • the mixture is then foamed and pre-frozen at step 21 and then fed to a belt freezer 22 for a further freezing step.
  • the frozen intermediate is then ground and sieved at step 23 to produce a particle size range of 0.3 to 3.5 mm, preferably 0.3 to 2.5 mm, more preferably 0.3 to 1.5 mm.
  • the intermediate is then vacuum dried at step 24 to produce the freeze-dried soluble coffee product 25 .
  • the product may then be packed in a container.
  • FIG. 4 b A modification to the process of FIG. 4 a is shown in FIG. 4 b .
  • the process is as described above with reference to FIG. 4 a up to step 22 .
  • the frozen intermediate is ground and sieved to produce a larger particle size range of 1.0 to 3.5 mm.
  • the intermediate is then vacuum dried at step 24 to produce an intermediate freeze-dried soluble coffee product 25 a .
  • the intermediate freeze-dried soluble coffee product 25 a is subject to a secondary grinding to reduce the particle size range to 0.3 to 1.5 mm to produce the freeze-dried soluble coffee product 25 .
  • the product may then be packed in a container.
  • FIG. 5 a shows a second freeze-dried process for forming a freeze-dried soluble coffee product 25 .
  • the process is the same as the first process described above with reference to FIG. 4 a with the exception that the milled and blended coffee product 30 is incorporated after the foaming and pre-freezing step 21 .
  • a high shear mixer 50 of the type described above may be used and in other respects the process is the same as the first process.
  • FIG. 5 b A modification to the process of FIG. 5 a is shown in FIG. 5 b .
  • the process is as described above with reference to FIG. 5 a up to step 22 .
  • the frozen intermediate is ground and sieved to produce a larger particle size range of 1.0 to 3.5 mm.
  • the intermediate is then vacuum dried at step 24 to produce an intermediate freeze-dried soluble coffee product 25 a .
  • the intermediate freeze-dried soluble coffee product 25 a is subject to a secondary grinding to reduce the particle size range to 0.3 to 1.5 mm to produce the freeze-dried soluble coffee product 25 .
  • the product may then be packed in a container.
  • An advantage of the modified processes of FIGS. 4 b and 5 b is that the particle size during vacuum drying is larger than in the processes of FIGS. 4 a and 5 a which has been found to lead to less product losses during drying. It has been found that with the processes of FIGS. 4 a and 5 a potential product losses occur when vacuum drying very small particle sizes due to the particles being carried off along with the evaporating water content of the intermediate.
  • a further advantage of each of the freeze-drying processes of the present disclosure described above is that it has been surprisingly found that a better freeze-drying performance is achieved and a higher concentration of soluble solids can be incorporated in the product prior to freeze drying where finely milled roasted ground coffee is included.
  • freeze-drying performance refers to the avoidance of dried product quality problems, specifically melt-back and sticky lumps.
  • Melt-back refers to the failure to remove water from each granule structure by sublimation during freeze drying, and ‘sticky lumps’ arise from the failure to remove water vapour that has sublimated from individual granules from the overall coffee bed tray.
  • a typical freeze drying process involves freezing of foamed coffee extract on a cold room belt. When frozen, the coffee slab is granulated and sieved to a particular granule size before drying in a freeze-dryer.
  • the capacity of a freeze dryer is limited by its de-watering ability.
  • the amount of water in the frozen coffee particles fed to the freeze-drier is dependent on the concentration of total coffee solids of the liquid coffee extract when it is frozen. The higher the coffee solids concentration the lower the water content and thus the freeze-drier requires less utilisation of its capacity to remove that water.
  • total coffee solids concentrations of up to 63% can be fed to a freeze-drier while avoiding melt-back and sticky lumps.
  • superior extracts of 56% and 60% concentration may be formed with 15% (by dry weight) of finely milled roasted ground coffee, with a particle size D50 of 30 to 40 microns and a D99 of below 60 microns, and 85% (by dry weight) of pure soluble coffee solids.
  • the base extract was prepared by re-dissolving freeze-dried granules and adding water to make the required concentration of coffee solids. Drying was carried out under the same conditions for all samples: the dryer was a Rayl model available from GEA Niro, of Soeborg, Denmark; samples were dried in a standard tray with the heating profile, initial product weight, particle size of feed material to dryer being identical.
  • the final extract had a coffee solids concentration of 56% (exclusively pure soluble coffee solids) and was foamed by air, frozen, grinded, sieved between 0.7 mm-3.35 mm sizes, and finally vacuum dried. Ice coffee granules were frozen at ⁇ 40 degrees C. and vacuum dried for 3.0 hrs or 3.4 hrs.
  • the final extract had a coffee solids concentration of 56% (made-up by soluble coffee solids from the base extract and coffee solids from the finely milled roasted ground coffee added before foaming with the end product comprising 15% by dry weight roasted ground coffee and 85% by dry weight equivalent soluble coffee) and was foamed by air, frozen, grinded, sieved between 0.7 mm-3.35 mm sizes and finally dried. Ice coffee granules were frozen at ⁇ 40 degrees C. and vacuum dried for 3.0 hrs or 3.4 hrs.
  • Sample 1-1 (Comparative) Sample 2-1 Feed to Dryer 56% 56% 56% 56% concentration (%) Drying time (Hrs) 3.4 3.0 3.4 3.0 Stickied Free flow of clumps clumps yes yes granules product from tray Quantity (%) 60.9 65.9 0.4 0.1 Physical Density 21.5 22.3 21.6 21.9 quality (g/100 ml)
  • FIG. 12 shows SEM photographs of the dried coffee products of Sample 1-1.
  • FIG. 13 shows SEM photographs of the dried coffee products of Sample 2-1.
  • Samples 2-1 containing finely milled roasted ground coffee show fewer collapsed areas in their structure compared to pure soluble solids Samples 1-1.
  • the final extract had a coffee solids concentration of 60%, (exclusively pure soluble coffee solids) and was foamed by air, frozen, grinded, sieved between 0.7 mm-3.35 mm sizes and finally vacuum dried. Ice coffee granules were frozen at ⁇ 40 C and vacuum dried for 3.0 hrs.
  • the final extract had a coffee solids concentration of 60% (made-up by soluble coffee solids from the base extract and coffee solids from the finely milled roasted ground coffee added before foaming with the end product comprising 15% by dry weight roasted ground coffee and 85% by weight equivalent soluble coffee) and was foamed by air, frozen, grinded, sieved between 0.7 mm-3.35 mm size and finally dried. Ice coffee granules were frozen at ⁇ 40 C and vacuum dried for 3.0 hrs.
  • Sample 1-2 (Comparative) Sample 2-2 Feed to Dryer 60% 60% concentration (%) Drying time (Hrs) 3.0 3.0 Stickied Free flow of clumps yes granules product from tray Quantity (%) 66 0 Physical Density 22.0 22.7 quality (g/100 ml)
  • FIG. 14 shows an SEM photograph of the dried coffee product of Sample 1-2.
  • FIG. 15 shows an SEM photograph of the dried coffee product of Sample 2-2.
  • Sample 2-2 containing finely milled roasted ground coffee shows fewer collapsed areas in structure compared to Sample 1-2.
  • frozen coffee extract which contains finely milled roasted ground coffee produces improved grinding performance in that fewer fines are generated compared to frozen coffee extracts formed from pure soluble coffee:
  • Frozen coffee chips Product (0.7-3.335 mm) Fines (below 0.7 mm) 56% concentration 80% 20% with finely milled roasted ground coffee 56% concentration 75% 25% without finely milled roasted ground coffee 60% concentration 79% 21% with finely milled roasted ground coffee 60% concentration 75% 25% without finely milled roasted ground coffee
  • Grinder screen 8 mm For the grinding, the same machine, process and parameters were used: Grinder screen 8 mm, sieve screen 0.7-3.35 mm
  • FIG. 6 shows a first spray-dried process for forming a spray-dried soluble coffee product 44 .
  • a coffee concentrate intermediate 20 (aromatised or non-aromatised) is mixed with a milled and blended coffee intermediate 30 using a high shear mixer 50 prior to the foaming step 41 .
  • a high shear mixer 50 of the type described above may be used.
  • the mixture is then foamed at step 41 and then filtered and optionally homogenised at step 42 .
  • the intermediate is then spray dried at step 43 to produce the spray-dried soluble coffee product 44 .
  • the product may then be packed in a container.
  • FIG. 7 shows a second spray-dried process for forming a spray-dried soluble coffee product 44 .
  • the process is the same as the first spray-dried process described above with the exception that the milled and blended coffee product 30 is incorporated into a dry mix.
  • the spray-drying apparatus (as known in the art) comprises a fines collector for recycling coffee powder fines.
  • the milled and blended coffee intermediate 30 is fed into the recycling line from the fines collector and is therefore incorporated into the product during the spray-drying stage.
  • the milled and blended coffee intermediate formed by jet milling has very good dispersion characteristics in liquids (such as hot water or concentrated liquid coffee extract).
  • Wet Helos of the stirred sample represents the particle size when first made up and is higher where there is poor dispersion of the finely ground roasted coffee particles in water, thereby forming “clumps” of material.
  • That clumps are formed can be determined by comparing to the Wet Helos with ultrasound measurement. The ultrasound acts to break up the clumps (if present).
  • the comparative Sample 1 formed with cryogenically-ground roasted coffee had poor dispersion characteristics and significant clumping—verified by the large difference between the wet Helos figures with and without ultrasound—even though the product had the same total roasted ground coffee content as Samples 2 to 4.
  • Samples 2 and 3 of the present disclosure have much better dispersion where the milled and blended coffee intermediate has 15 or 30% by dry weight roasted ground coffee.
  • Sample 4 with 50% by dry weight roasted ground coffee shows some improvement over the prior art composition but less than Samples 2 and 3.
  • Another aspect of the present disclosure relates to a novel freeze-dried soluble coffee product having an appearance reminiscent of roasted ground coffee.
  • the roasted ground coffee particles are preferably colloidal in size with a dry Helos particle size distribution D90 of less than or equal to 100 microns, preferably less than or equal to 50 microns, more preferably less than or equal to 30 microns.
  • the roasted ground coffee may constitute 5 to 30% by dry weight of the freeze-dried product.
  • the roasted ground coffee may be derived from cryogenic milling of whole roasted coffee beans. However, preferably, the roasted ground coffee is obtained by the milling process of the present disclosure described above with reference to FIG. 1 in which the roasted ground coffee is a component of the milled and blended coffee intermediate.
  • the roasted ground coffee may be incorporated into the product by high shear mixing.
  • the milled and blended coffee intermediate of the present disclosure is to be used, the roasted ground coffee is incorporated using one of the processes described above with reference to FIGS. 4 and 5 .
  • the freeze-dried coffee end product has a colour of 13 to 30 La units on the Lange scale, preferably 16 to 25 La units, more preferably 17 to 20 La units.
  • the density of the soluble coffee product also has an affect on the colour. Typically the denser the product the darker the colour. However, it is undesirable to have a soluble product that is too dense.
  • the present disclosure provides a flexible alternative which can be used separately from (or in combination with) control of the density of the product to select the desired product colour.
  • FIG. 8 illustrates results for a first set of three sample products, A to C.
  • the total solids soluble coffee solids and roasted ground coffee solids where applicable
  • concentration of the product fed to the freeze-drier was 50% and the drying time was 3.37 hours.
  • Samples A to C had the following characteristics:
  • Standard Net Robusta concentrated extract was foamed and freeze-dried using known prior art techniques without the inclusion of any roasted ground coffee.
  • the datum colour change of 0 is set for a density of Sample A of 210 g/l.
  • An increased density of 220 g/l results in a colour change of ⁇ 1.5 La units.
  • An increased density of 230 g/l results in a colour change of ⁇ 2.7 La units.
  • Sample B Compared to Sample A, Sample B produced a darker product with a colour change of ⁇ 3.0 La units at a density of 210 g/l; ⁇ 3.8 La units at a density of 220 g/l.
  • Sample C Compared to Sample A, Sample C produced a darker product with a colour change of ⁇ 1.5 La units at a density of 210 g/l; ⁇ 2.4 La units at a density of 220 g/l and ⁇ 3.4 La units at a density of 230 g/l.
  • Standard Net Arabica concentrated extract was foamed and freeze-dried without the inclusion of any roasted ground coffee.
  • the datum colour change of 0 was set for a density of sample of 220 g/l for three conditions; feed to dryer solids concentration of 56% with 3 hrs drying time, feed to dryer solids concentration of 60% with 3 hrs drying time and feed to dryer solids concentration of 56% with 3.37 hrs drying time.
  • freeze-dried product is more pronounced of roasted ground coffee where it is ground at step 23 to a particle size of 0.3 to 3.5 mm, preferably 0.3 to 2.5 mm, more preferably 0.3 to 1.5 mm.
  • the milled and blended coffee product described above or the soluble coffee product described above or the freeze-dried soluble coffee product described above may be packaged for sale in a container such as a jar 101 as shown in FIG. 9 .
  • the milled and blended coffee product or the soluble coffee product or the freeze-dried soluble coffee product may be packaged in a container suitable for use in a beverage preparation machine.
  • FIG. 10 shows a suitable container in the form of a cartridge 102 that may be used in a beverage preparation machine 103 as shown in FIG. 11 .
  • the product may contain one or more additional beverage components such as natural or artificial sweeteners, dairy or non-dairy based creamers, lactose, vegetable fat, whey proteins, emulsifiers, stabilisers, modified starches, carriers, fillers, flavours, colours, nutrients, preservatives, flow agents or foaming agents.
  • additional beverage components such as natural or artificial sweeteners, dairy or non-dairy based creamers, lactose, vegetable fat, whey proteins, emulsifiers, stabilisers, modified starches, carriers, fillers, flavours, colours, nutrients, preservatives, flow agents or foaming agents.

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